Further temptation in the same direction is offered by the

recent discovery[4] that the processes of development
stimulated in the eggs of the sea urchin Arbacia by butyric
acid or weak bases, and evidenced by the formation of the
fertilization membrane, is reversible
Further temptation in the same direction is offered by the
recent discovery[4] that the processes of development
stimulated in the eggs of the sea urchin Arbacia by butyric
acid or weak bases, and evidenced by the formation of the
fertilization membrane, is reversible. When such eggs are
treated with a weak solution of sodium cyanide or chloral
hydrate, they return to the resting condition. Upon
fertilization with spermatozoa, in normal sea water, they
proceed again to develop.